Home / 138,869.04-191,628.15-78,445.53

Finding the Fourth Proportional to 138,869.04, 191,628.15 and 78,445.53

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Solution

The fourth proportional to 138,869.04, 191,628.15 and 78,445.53 is: 108,248.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,869.04 : 191,628.15 = 78,445.53 : x
  2. Step 2: Convert to fraction form
    138,869.04/191,628.15 = 78,445.53/x
  3. Step 3: Cross multiply
    138,869.04x = 191,628.15 × 78,445.53
  4. Step 4: Simplify right side
    138,869.04x = 15,032,371,789.67
  5. Step 5: Solve for x
    x = 15,032,371,789.67/138,869.04
  6. Step 6: Final answer
    x = 108,248.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.